Method of treating hair with heat and a cap which provides a signal regarding treatment

ABSTRACT

A hair covering which comprises a woven or nonwoven substrate comprising synthetic or natural materials, which are impregnated, or coated, or both, with a mutable dye is described.

BACKGROUND OF THE INVENTION

[0001] There are many hair treatment compositions, which are applied tohair, and afterwards partially left in, and then heat is applied to thehair in order to activate the hair treatment agent, then may eitherrinse out or leave in. These treatment agents can include gels,shampoos, conditioners, leave-in conditioners, pomades, straighteningbalms or balms, serums, tonics, straightening and smooth creams andlotions and balms, semi and permanent hair coloring dyes, and the like.

[0002] In the past, people who desired to treat their hair in thismanner faced the following problems:

[0003] (i) they did not know if they had treated their hair for asufficient amount of time;

[0004] (ii) they would not know whether they had treated all of theirhair;

[0005] (iii) they were not holding their hair in place, duringtreatment;

[0006] (iv) without the use of a cap, hair treatment agents tended todrip off of the hair.

[0007] It is an object of the present invention to address theseabove-mentioned problems.

[0008] The following patent is related to the field of the invention.

[0009] U.S. Pat. No. 4,725,462 discloses a woven textile fabric havinghidden indicia which appear when the textile fabric is subjected totemperatures above 108° F.

SUMMARY OF THE INVENTION

[0010] A hair covering which comprises a woven or nonwoven substratecomprising synthetic or natural materials, which are impregnated, orcoated, or both, with a mutable dye is described.

DESCRIPTION OF THE FIGURE

[0011]FIG. 1 is a cross section of an embodiment of a hair covering ofthe invention.

DETAILED DESCRIPTION OF THE INVENTION

[0012] As used herein, %, means weight % of the total composition unlessotherwise indicated. A woven substrate means a substrate that is formedby interlacing or intertwining strands or fibers.

[0013] A nonwoven substrate means its layer is comprised of fibers whichare not woven into a fabric but rather are formed into a sheet, mat, orpad layer. These fibers can either be random (i.e., randomly aligned) orthey can be carded (i.e., combed to be oriented in primarily onedirection). Furthermore, the nonwoven substrate can be composed of acombination of layers of random and carded fibers.

[0014] A mutable dye means that it is capable of change, i.e., changefrom one color or another, or from colorless to color or vice versa. Anexample would be a thermally labile or thermally sensitive dye.Thermochromatic dyes are examples of a mutable dye. Thermochromatic dyescan include leukodyes. Thermochromatic dyes can include liquid crystals.

[0015] The invention relates to a hair covering which comprises a wovenor nonwoven (substrate) comprising natural or synthetic materials, whichis impregnated, or coated, or both, with a mutable dye.

[0016] The invention also relates to a process for heat treating hair,which comprises:

[0017] i) applying to said hair a hair treating agent which is activatedby heat;

[0018] ii) covering the hair with a hair covering as described above;and

[0019] iii) heating the hair covering until the mutable dye changescolor so as to indicate that said hair has been adequately heat treated;and

[0020] that the hair treating agent has been left in the hair asufficient amount of time.

[0021] As noted above, a difficulty with applying to hair a heatsensitive treatment agent, lies in knowing when enough heat has beenapplied to the hair.

[0022] The present invention solves this problem by applying a haircovering which is impregnated or coated or both with a mutable dye. Aheat sensitive hair treatment agent is applied to the hair, the hair isthen covered with the hair covering. Heat from an appliance such as ablow drier is then applied to the hair covering. When the mutable dye inthe hair covering changes color, this serves to signal that adequateheat has been applied to the hair, and the heat treatment of the hairhas been completed.

[0023] There are many advantages to the present invention. In the firstplace, the hair covering serves to indicate when adequate heat has beenapplied. In addition, the hair covering serves to indicate that the hairtreating agent has been applied for a sufficient amount of time. Also,the hair covering serves to hold the hair in place while heat is beingapplied. When heat is applied to uncovered hair with a blow drier, thehair tends to get blown around which can be messy. In addition, a haircovering can serve to prevent hair treatment agent from dripping duringthe treatment period. Moreover, depending on the material of the haircovering, it can serve to transmit heat uniformly from the hair coveringto the hair. Also consumers enjoy the feeling of being pampered, whichcomes with wearing the nicely fitting, nicely colored, and well-texturedhair coverings of the present invention.

[0024] Hair coverings of the present invention can be made by knownmethods or by methods which are analogous to those known in the art.

[0025] What follows is a description of the components that can go intothe making of a hair covering of a composition of the invention.

Fabric or Substrate of the Hair Covering

[0026] Nonlimiting examples of suitable insoluble substrates which canbe used in the present invention and which meet the above criteriainclude nonwoven substrates, woven substrates, hydroentangledsubstrates, air entangled substrates, natural sponges, syntheticsponges, polymeric netted meshes, and the like. Preferred embodimentsemploy nonwoven substrates since they are economical and readilyavailable in a variety of materials. By nonwoven is meant that the layeris comprised of fibers which are not woven into a fabric but rather areformed into a sheet, mat, or pad layer. The fibers can either be random(i.e., randomly aligned) or they can be carded (i.e., combed to beoriented in primarily one direction). Furthermore, the nonwovensubstrate can be composed of a combination of layers of random andcarded fibers.

[0027] Nonwoven substrates may be comprised of a variety of materialsboth natural and synthetic. By natural is meant that the materials arederived from plants, animals, insects or by-products of plants, animals,and insects. By synthetic is meant that the materials are obtainedprimarily from various man-made materials or from natural materialswhich have been further altered. The conventional base starting materialis usually a fibrous web comprising any of the common synthetic ornatural textile-length fibers, or mixtures thereof.

[0028] Nonlimiting examples of natural materials useful in the presentinvention are silk fibers, keratin fibers and cellulosic fibers.Nonlimiting examples of keratin fibers include those selected from thegroup consisting of wool fibers, camel hair fibers, and the like.Nonlimiting examples of cellulosic fibers include those selected fromthe group consisting of wood pulp fibers, cotton fibers, hemp fibers,jute fibers, flax fibers, and mixtures thereof.

[0029] Nonlimiting examples of synthetic materials useful in the presentinvention include those selected from the group consisting of acetatefibers, acrylic fibers, cellulose ester fibers, methacrylic fibers,polyamide fibers, polyester fibers, polyolefin fibers, polyvinyl alcoholfibers, rayon fibers, polyurethane foam, and mixtures thereof. Examplesof some of these synthetic materials include acrylics such as acrilan,creslan, and the acrylonitrile-based fiber, orlon; cellulose esterfibers such as cellulose acetate, arnel, and acele; polyamides such asnylons (e.g., nylon 6, nylon 66, nylon 610, and the like); polyesterssuch as fortel, kodel, and the polyethylene terephthalate fiber, dacron;polyolefins such as polypropylene, polyethylene; polyvinyl acetatefibers; polyurethane foams and mixtures thereof. These and othersuitable fibers and the nonwoven materials prepared therefrom aregenerally described in Riedel, “Nonwoven Bonding Methods and Materials,”Nonwoven World (1987); The Encyclopedia Americana, vol. 11, pp. 147-153,and vol. 26, pp. 566-581 (1984); U.S. Pat. No. 4,891,227 to Thaman etal., issued Jan. 2, 1990; and U.S. Pat. No. 4,891,227, to Thaman et al.,issued Jan. 2, 1990; and U.S. Pat. No. 4,891,228 which are allincorporated by reference herein in their entirely.

[0030] Nonwoven substrates made from natural materials consist of websor sheets most commonly formed on a fine wire screen from a liquidsuspension of the fibers. See C. A. Hampel et al., The Encyclopedia ofChemistry, third edition, 1973, pp. 793-795 (1973); The EncyclopediaAmericana, vol. 21, pp. 376-383 (1984); and G. A. Smook, Hand of Pulpand Paper Technologies, Technical Association for the Pulp and PaperIndustry (1986); which are incorporated by reference herein in theirentirely.

[0031] Substrates made from natural materials useful in the presentinvention can be obtained from a wide variety of commercial sources.Nonlimiting examples of suitable commercially available paper layersuseful herein include Airtex®, an embossed airlaid cellulosic layerhaving a base weight of about 85 grams per square meter, available fromJames River, Green Bay, Wiss.; and Walkisoft®, an embosssed airlaidcellulosic having a base weight of about 90 grams per square meter,available from Walkisoft U.S. A., Mount Holy, N.C.

[0032] Methods of making nonwoven substrates, including aperturedsubstrates, are well known in the art. Generally, these nonwovensubstrates can be made by air-laying, water-laying, melt blowing,conforming, spin bonding, or carding processes in which the fibers orfilaments are first cut to desired lengths from long strands, passedinto a water or air stream, and then deposited onto a screen or beltthrough which the fiber-laden air or water is passed. The resultinglayer, regardless of its method of production or composition, is thensubjected to at least one of several types of bonding operations toanchor the individual fibers together to form a self-sustaining web. Inthe present invention the nonwoven layer can be prepared by a variety ofprocesses including hydroentanglement, thermally bonding orthermo-bonding, and combinations of these processes. Moreover, thesubstrates used in the present invention can consist of a single layeror multiple layers. In addition, a multi-layered substrate can includefilms and other non-fibrous materials.

[0033] Moreover, substrates can also be made which use liquid crystalthermochromic substances on substrates. In this connection, attention isdirected to U.S. Pat. Nos. 6,270,783; 5,705,093; and 5,690,857, all ofwhich are hereby incorporated by reference. WO 91/09106 is also herebyincorporated by reference.

[0034] Hair Covering

[0035] A hair covering, as shown in FIG. 1, has an upper edge, 10, whichleads to a string for tying, 12, which leads to a bottom edge, 14, whichforms the opening for the head. The upper edge, 14, also has a button,16, for securing the hair covering to the head.

MUTABLE DYES

[0036] Thermochromic Material

[0037] The thermochromic material which can be used in the presentinvention includes, among others, a variety of known thermochromicmaterials each containing an acid responsive chromogenic substance andan acidic substance.

[0038] The acid-responsive chromogenic substance in said thermochromicmaterial includes triphenylmethanephthalide compounds, phthalidecompounds, phthalan compounds, acyl-leucomethylene blue compoundsfluoran compounds, triphenylmethane compounds, diphenylmethanecompounds, spiropyran compounds and so on. Among species of suchcompounds are 3,6-dimethoxyfluroran, 3,6-dibutoxyfluoran, 3-diethylamino6,8-dimethylfluoran, 3-chloro-6-phynylaminofluoran,3-diethylamino-6-methyl-7-chlorofluoran, 3-diethylamino7,8-benzofluroran, 2-anlino-3-methyl-6-diethylamino fluoran, 3,3′,3″-tris(p-dimethylaminophenyl) phthalide,3,3′-bis(p-dimethylaminophenyl) phthalide,3-diethylamino-7-phenylaminofluoran,3,3-bis(p-diethylaminophynel)-6-dimethylaminophthalide,3-(4-diethylaminophenyl)-3-(1-ethyl-2-methylindol-3-yl) phthalide,3-(4-diethylamino-2-mehtyl) phenyl-3-(1,2-dimethylindol-3-yl)phthalide,2′-(2-chloroanilino)-6′dibutylaminospiro-[phthalido-39′-xanthenel3 andso on.

[0039] The acidic substance mentioned above includes,1,2,3-benzotriazole compounds, phenol compounds, thiourea compounds,oxo-aromatic carboxylic acids and soon. Among specific examples of suchcompounds are 5-butylbenzotriazole, bisbenzotriazole-5-methane, phenol,nonylphenol, bisphenol A, bisphenol F, 2,2′-biphenol, β-naphthol,1,5-dihydroxynaphthalene, alkyl p-hydroxybenzoates, phenol resinoligomer and so son.

[0040] The amount of the acidic substance may be in the range of about0.1 to 50 parts by weight per part by weight of the acid-responsivechromogenic substance.

[0041] Any of the thermochromic materials each containing anacid-responsive chromogenic substance and an acidic substance ispreferably used as diluted with a solvent beforehand. The use of asolvent renders the material responsive to change in temperature withgreater sensitivity and definition. The solvent which can be used forthe thermochromic material includes, among others, alcohols,alcohol-acrylonitrile adducts, azomethine compounds, esters and so on.Among specific examples of the solvent are decyl alcohol, laurylalcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenylalcohol, lauryl alcohol-acrylonitrile adduct, myristylalcohol-acrylonitrile adduct, a steryl alcohol acylonitrile adduct,benzylidene-p-toluidine, benzylidene-butylamine, octyl caprate, decylcaprate, myristyl caprylate, decyl laurate, lauryl laurate, myristyllaurate, decyl myristate, lauryl myristate, cetyl myristate, laurylpalmitate, cetyl palmitate, stearyl palmitate, cetyl p-t-butyl benzoate,stearyl 4-methoxybenzoate, dilauryl thiodipropionate, dimyristylthiodipropionate, stearyl benzoate, benzyl starat, dibenzylthiodipropionate, distearyl thiodipropionate, benzyl benzoate, glyceroltrilaurate and so on.

[0042] The amount of the solvent may be in the range of 0 to 800 partsby weight, preferably 0.1 to 100 parts by weight, per part by weight ofthe acid-responsive chromogenic substance.

[0043] Nonlimiting examples of thermochromatic dyes also can includeMichler's hydrol, Crystal Violet carbinol, Malachite Green carbinol,N-(2,3-dichlorophenyl)-leuco auramine, N-benzoyl auramine, N-acetylauramine, N-phenyl auramine, Rhodamine B lactam,2-(phenyliminoethylidene)-3,3-dimethyl-indoline,N,3,3-trimethyl-indolinobenzo-spiropyran,8′-methoxy-N,3,3-trimethylindolino-spiropyran,3-diethylamino-6-methyl-7-chloro-fluoran,3-diethylamino-7-methoxy-fluoran, 3-dimethylamino-6-benzyloxy-fluoran,1,2-benzo-6-diethylaminofluoran,3,6-di-p-toluidino-4,5-dimethylfluoran-phenylhydrazide-gamma.-lactam,3-amino-5-phenyl-8-methyl-fluoran,2-methyl-3-amino-6-methyl-7-methyl-fluoran,2,3-butylene-6-di-n-butylamino-fluoran,3-diethylamino-7-anilino-fluoran,3-diethylamino-7-(p-toluidino)-fluoran,7-acetamino-3-diethylamino-fluoran, 2-bromo-6-cyclohexylamino-fluoran,2,7-dichloro-3-methyl-6-n-butylamino-fluoran and the like.

[0044] Nonlimiting examples of thermochromatic dyes can also includefrom about 1% to about 20% by weight of one or more electron-donating,chromatic organic compounds selected from the group consisting of diarylphthalides, polyaryl carbinols, leuco auramines, lactum leuco compounds,indolines, spiropyrans and fluoranes, and one or more electron-donatingchromatic organic compounds selected from the group consisting of diarylphthalides, indolyl phthalides, polyaryl carbinols, leuco auramines,acyl auramines, aryl auramines, Rhodamine B lactam, indolines,spiropyrans and fluorans, and one or more electron-donating, chromaticorganic compounds selected from the group consisting of diarylphthalides, aryl phthalides, indolylphthalides, polyarylcarbinols,leucoauramines, acrylauramines, arylauramines, rhodamine B lactams,indolines, spiropyrans, fluorans, thiofluorans, phenothiazines,triphenylmethanes, diarylarylfurans, spiroxanthenearylfurans, andchromenoindoles.

[0045] Nonlimiting examples of thermochromatic dyes also can includeelectron-donating, chromatic organic compounds such as3-amino-5-methylfluoran,3-diethylamino-6-methyl-7-dimethylamino-thiofluoran,3-diethylamino-7-dibenzylamino-thiofluoran,3,3-bis(1-ethyl-2-methyl-3-yl)phthalide,3,3-bis(2-phenylindol-3-yl)phthalide,3-(4-diethylaminophenyl)-3-(1-ethyl-2-methylindol-3-yl) phthalide,3-(4-di-n-butylaminophenyl) 3-(2-phenylindol-3-yl) phthalide,3-(duroridine-6′-yl)-3-(1′-methyl-2′-phenylindol-3′-yl)phthalide, 3-(1′,2′, 3′, 4′-tetrahydroquinolin-6-yl) 3-(1-ethyl-2indol-3′-yl)phthalide,3,3-bis(1-ethyl-2-methyl-indol-3-yl)-7-azaphthalide,3-(diphenylamino)-3-(1-ethyl-2-methylindol-3-yl)phthalide,3-[N-(4-ethoxyphenyl)N-phenylamino]-3-(1-ethyl-2-methylindol-3-yl)phthalide,3-[4-(dimethylamino)phenyl]-3-[N,N-bis-(4-octyl phthalide,3-[4-(ethylbenzylamino)phenyl]-3-[N-(4-ethoxyphenyl)N-phenylaminolphthalide, 2,2-bis(p-N,N-dimethylaminop2-H-naphtho[1,8-bc]furan, spiro-3,6-bis(dimethylamino)xanthen-9,2-(2H)-naphtho[1,8-bc]furan,6,6-bis(4-dimethylaminophenyl)-6H-chromeno[4,3-b] indole and the like.

[0046] These dyes are described in U.S. Pat. Nos. 4,028,118; 4,421,560;and 4,421,561, all of which are hereby incorporated by reference.

[0047] Thermochromatic dyes which can be used in the present inventionalso include liquid crystals which can be spray-coated onto a substratesuch as are described in U.S. Pat. No. 5,376,699 which is herebyincorporated by reference.

[0048] The preferred thermochromic substances to be used in the presentinvention include chiral nematic liquid crystals, cholesteric liquidcrystals and smectic liquid crystals. Preferably, microencapsulatedchiral nematic liquid crystals suspended in aqueous medium are used inthe invention. Various types of suitable thermochromic substances aredisclosed in UK Patent Specification Nos. 1556994,1592161, 1596012,1596013,1596014 and 1603076.

[0049] The thermochromic substances used in the present inventionpreferably exhibit several color changes over a range of temperatures,typically −30-150 degrees Celsius, preferably 0-50 degrees Celsius, andespecially temperatures such as produced by contact with the body. Thethermochromic substances may be colorless or black and typical colorchanges may be from colorless or black to tan to red to green to blue.Two or more thermochromic substances may be used which change color atdifferent temperatures so that a mixture of color changes may beproduced.

[0050] The method of the invention may be used on individual fibers,fabrics prior to making up into a garment or cap or hair covering.Preferred fibers and fabrics will be black, although other dark coloredsubstrates have also been found to be suitable. Paler colored substratesmay also be used by first overprinting with a darker, preferably blacklayer. They may also advantageously be fine, thin or supple. Suitablefabrics include cotton, polyester, silks and chiffons.

[0051] The compositions used in the invention may be applied to fibersand fabrics in any suitable way, such as by printing, including screenprinting, spraying, dipping, brushing, laminating, doctor bar, wirewound bar and electrostatic pressing. See, e.g., WO 90/02054.

EXAMPLE

[0052] A surface coating medium is made containing 30 parts by weight ofan encapsulated thermochromic liquid crystal dispersion Licritherm. RTM.TCC-1001 (commercially available from Merck Ltd., Poole/UK), 5 parts byweight of an acrylic polymer HV30.RTM. (commercially available fromAllied Colloids Ltd.), 30 parts by weight of a fusible polyamide powderGriltex 5.RTM. (P1) (commercially available from EMS-Grilon UK, Ltd.), 5parts by weight of an ammonia solution (10% aqueous solution) and 30parts by weight of water.

[0053] The medium is printed onto a woven black polyester/cotton fabricby screen printing (180 threads per inch) and air-dried at 50.degree. C.for 10 minutes.

[0054] It should be understood that the term ‘thermochromic material’ isused herein to mean any and all thermochromic materials inclusive ofpseudo-thermochromic materials which show a hysteresis ofthermochronism. Thermochromatic dyes can include leukodyes.

[0055] In accordance with the present invention, the hair covering mayonly partially cover the hair, hereby allowing some of the hair to beheat treated while the rest is not.

[0056] The hair treatment methods of the invention may be carried out inconjunction with other treatments such as hair cutting and haircoloring.

[0057] The mutable dye may be impregnated or coated onto the covering inthe form of a design, a logo, or an insignia.

[0058] The mutable dye may blend with other permanent or non-mutabledyes so as to cause a color change. For example, the hair covering mayhave on it a permanent dye which is blue and a mutable dye which isyellow. Together, these dyes form the color green. When heat is appliedto the hair covering, the mutable dye which is yellow, may disappear incolor, thereby leaving the color blue.

[0059] The hair covering of the invention may contain two or moremutable dyes, one which changes color at a threshold temperature, andthe second, which changes color at a still higher temperature. Colorchange by the first dye may indicate that a desired thresholdtemperature has been reached. Color change by the second dye mayindicate that the hair has been brought to too high a temperature.

[0060] Hair treatment compositions which may be employed in the methodsof the invention can include gels, shampoos, conditioners, leave-inconditioners, pomades, straightening balms, serums, tonics, creams,lotions, dyes, semi-permanent dyes and the like.

[0061] Nonwoven material which may be included in the hair coverings ofthe invention may include polypropylene. Polypropylene fabrics which maybe included in the hair coverings of the present invention can range inweight from about ½ OSY to about 5 OSY.

[0062] The Tg of the polymer employed in a hair covering of theinvention will usually exceed the activation temperature of thethermochromatic dye in the hair covering. The usual temperature rangethat hair experiences during blow drier using is about 49° C.+/−5-6° C.However, the Tg of the polymer can be slightly higher or significantlyexceed the activation temperature of the thermochromatic dye and such Tgcan range from about 55° C. to greater than 300° C.

[0063] The following are examples of hair treatment agents, and morespecifically hair conditioning agents, which may be employed in themethods of the present invention. These examples are meant to illustratebut not limit the invention. Ingredients A B C D PEG-2 OleammoniumCloride, 69% active 2.00 2.00 2.00 — and Propylene Glycol, 31 active %¹Quaternium-18, 75% active and Propylene — — — 0.73 Glycol, 25% active²Behentrimonium Chloride, 85% active and — — — 1.40 Isopropyl Alcohol,15% active³ Stearamidopropyldimethylamine, 100% — 0.75 0.75 — active⁴Behenetrimonium Methosulfate, 25% active — 1.00 1.00 — and CetearylAlcohol, 100% active⁵ Ceteary~ Alcohol, 100% 8.25 10.00 8.00 4.00Dimethiconol, 36.5% active and 2.00 2.00 2.00 1.60TEA-Dodecylbenzenesulfonate, 4.5% active⁶ Cyclopentasiloxane, 99%active⁷ 2.00 2.00 2.00 2.00 Other⁸ Q.S. Q.S. Q.S. Q.S.

[0064] Examples A, B, C and D are prepared by methods which are known inthe art.

[0065] While the invention has been described in complete detail andpictorially shown in the accompanying drawings, it is not to be limitedto such details, since many changes and modifications may be made in theinvention without departing from the spirit and the scope thereof.Hence, the invention is intended to cover any and all modifications andforms which may come within the language and scope of the claims.

1. A hair covering which comprises a woven or non-woven fabric,comprising natural or synthetic materials, which is impregnated, coatedor both impregnated and coated, with at least one mutable dye.
 2. A haircovering according to claim 1, wherein a fragrance is embedded into saidfabric.
 3. A hair covering according to claim 1, wherein said mutabledye is thermochromatic.
 4. A hair covering according to claim 3, whereinsaid mutable dye is selected from the group consisting of:3,3;-dimethoxyfluoran (yellow), 3-chloro-6-phenylaminofluoran (orange),3-diethylamino-6-6methyl-7-chlorofluoran (vermilion), 3-diethyl-7,8-benzofluoran (pink), Crystal Violet lactone (blue), 3,3′,3″-tris(p-dimethylaminophenyl) phthalide (purplish blue), MalachiteGreen lactone (green), 3,3′-bid-(p-dimethylaminophenyl) phthalide(green) and 3-diethylamino-6-methyl-7-phenylaminofluoran (black), idolylphthalides, spiropyrans, coumarins, 3,6-dimethoxyfluoran,3,6-dibutoxyfluoran, 3-diethylamino-6,8-dimethylfluoran,3-chloro-6-phenylaminofluoran, 3-diethylamino-6-methyl-7-chlorofluoran,3-diethylamino 7,8-benzofluran,2-anilino-3-methyl-6-diethylaminofluoran,3,3′,3″-tris(p-dimethylaminophenyl)phthalide, 3,3′-bis(p-dimethylaminophenyl) phthalide,3-diethylamino-7-phenylaminofluoran,3,3-bis(p-diethylaminophenyl)-6-dimethylaminophthalide,3-(4-diethylaminophenyl)-3-(1 -ethyl-2-methylindol-3-yl) phthalide,3-(4-diethylamino-2-methyl)phenyl-3-(1,2-dimethylindol-3-yl) phthalide,2′-(2-chloroanilino)-6′-dibutylaminospiro-[phthalido-3,9′-xanthene] andmixtures thereof.
 5. A hair covering according to claim 1 wherein saidfabric comprises a material selected from the group consisting of wovensubstrates, nonwoven substrates, hydroentangled substrates, airentangled substrates, natural sponges, synthetic sponges, and polymericnetted sponges and mixtures thereof.
 6. A hair covering according toclaim 1 wherein said fabric comprises a material selected from the groupconsisting of silk fiber, wool fiber, camel hair, wood pulp fiber,cotton fiber, hemp fiber, jute fiber, flax fiber, and mixtures thereof.7. A hair covering according to claim 1, wherein said fabric comprises amaterial selected from the group consisting of: Acrilan, creslan, orIon,cellulose, acetate, arnel, and acele; polyamides; polyesters, and thepolyethylene terephthalate fiber, dacron; polypropylene, polyethylene;polyvinyl acetate fibers; polyurethane foams and mixtures thereof.
 8. Ahair covering according to claim 1, wherein said fabric iswater-insoluble.
 9. A hair covering according to claim 1, wherein oneportion of said fabric is fastened to another portion of said fabricthrough use of a device selected from the group consisting of a buttonand hole, a button and loop, velcro, a buckle, and a snap button.
 10. Aprocess for treating hair which comprises: i) contacting said hair witha hair treatment agent which is activated by heat; ii) covering saidhair or a part of said hair with a hair covering according to claim 1;iii) applying heat to said hair covering whereby said hair coveringchanges color indicating that said hair treatment agent in said hair,has been activated by said heat.
 11. A process according to claim 10,wherein said hair treatment agent is a hair conditioner.
 12. A kit fortreating hair which comprises: i) a hair covering according to claim 1;and ii) a hair treatment agent.
 13. A kit for treating hair whichcomprises: i) a hair covering according to claim 1; ii) a hair treatmentagent; and iii) a source of heat.
 14. A process according to claim 10,wherein said hair treatment agent is selected from the group consistingof a gel, a shampoo, a rise-out conditioner, a leave-in conditioner, astraightening product, a smoothing product, a serum, a pommade, asemi-permanent dye, and a permanent dye.
 15. A hair covering accordingto claim 1, which comprises at least two mutable dyes, wherein one dyechanges color at a first temperature, and wherein a second dye changescolor at a second temperature different from said first temperature. 16.A hair covering according to claim 1, wherein said mutable dye isimpregnated in said fabric in a design, a logo or an insignia.
 17. Ahair covering according to claim 1, wherein said fabric has a Tg whichis substantially higher than the temperature of a heat source.
 18. Ahair covering according to claim 1, wherein said mutable dye is aleukodye.
 19. A hair covering according to claim 18, wherein saidmutable dye is selected from the group consisting of:1,3,3-trimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)( 1,4)-oxazine],6′-indolino-1,3,3-trimethylspiro[indoline-2,3′-(3H)naphtho(2,-b)(1,4)-oxazine],5-chloro-1,3,3-trimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)(1,4)-oxazine,6′-piperidino-1,3,3-trimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)(1,4)-oxazine],-benzyl-3,3-dimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)(1,4)-oxazine],1,3,5,6-tetramethyl-3-ethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)(1,4)-oxazine],1,3,3,5,6-pentamethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)(1,4)-oxazine],1,3,5,6-tetramethyl-3-ethylspiro[indoline-2,3′-(3H)pyrido(3,2-(1,4)-benzoxazine], 1,3′,3′-trimethylspiro(2H-2-benzopyran-2,2′-indoline),1,3,3-triphenylspiro[indoline 2,3′-(3H)naphtho(2,1-b)pyran],1-(2,3,4,5,6-pentamethylbenzyl)-3,3-dimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)pyran],1-(2-nitrobenzyl)-3,3-dimethylspiro[indoline-2,3′-(3H)naphtho(2,1-b)pyran],2,2-diphenylnaphtho(2,1-b) pyran,2,2-di(p-methoxyphenyl)naphtho(2,1-b)pyran, 2,5dimethylfuryltrimethylfulgide, 2-methyl-5-chlorotrimethylfulgide,spiro[2H-chromen-2,2′-tricyclo[3.3.1.1 .sup.3.7]decane,spiro[2H-naphtho[1,2-b]pyran-2,2′-tricyclo[3.3.1.1 .sup.3.7]decane],5,7-dimethylspiro[2H-chromene-2,2′tricyclo[3.3.1.1.sup.3.7 ]decane],6-(4-methoxyphenyl)-9-methoxyspiro[2Hnaphtho[1,2-b]pyran-2,2′-tricyclo][3.3.1.1.sup.3.7]decane],6-chlorospiro[2H-naptho[1,2-b]pyran-2,2′-tricyclo[3.3.1.1.sup.3.7]decane and mixtures thereof.
 20. A hair covering according to claim 1,which comprises at least one mutable dye and at least one non-mutabledye.
 21. A process for treating hair which comprises: 1 . contactingsaid hair with a hair treatment agent;
 2. covering said hair or a partof said hair with a hair covering according to claim 1;
 3. applying heatto said hair covering whereby said hair covering changes colorindicating that said hair treatment has been left on the hair asufficient amount of time.